2015年考研英语一真题(试题).docxVIP

2015年考研英语一真题 Directions Section I Use of English Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET. (lOpoints) Though not biologically related, friends are as related as fourth cousms, sharing about 1% of genes. That is 1 a study, published from the University of California and Yale University in the Proceedings of the National Academy of Sciences, has 2 The study is a genome-wide analysis conducted 3 1,932 unique subjects which 4 pairs of unrelated friends and unrelated strangers. The same people were used in both_5_ While 1% may seem 6 , it is not so to a geneticist. As James Fowler, professor of medical genetics at UC San Diego, says, Most people do not even 7 their fourth cousins but somehow manage to select as friends the people who 8 our kin. The study_9_ found that the genes for smell were something shared in friends but not genes for immunity. Why this similarity exists in smell genes is difficult to explain, for now. 10 as the team suggests, it draws us to similar environments but there 1s more 11 it. There could be many mechanisms working together that 12 us in choosing genetically similar friends _D functional kinship of being friends with 14 One of the remarkable findings of the study was that the similar genes seem to be evolving 15 than other genes. Studying this could help 16 why human evolution picked pace in the last 30,000 years, with social environment being a major 17 factor. The findings do not simply explain peoples -?1?8? to befriend those of similar 19 backgrounds, say the researchers. Though all the subjects were drawn from a population of European extraction, care was taken to 20 that all subjects, friends and strangers, were taken from the same population. . 1. [A] when [A] defended [A] for [A] compared [A] tests [A] insignificant [A] visit [A] resemble [A] again [A] Meanwhile [A] about [A] drive [A] according to [A] chances [A] later [A] fo